I don't ever remember that being said. All I remember is that Madara wanted Obito to revive him into a regular body and not an Edo body which will end up killing Obito.
Ok, I must be sleepy. Work today is really boring. Nothing but cold outside. At least I have Internet to chat with you guys.
Also, what might be interesting to see is if Madara's plan doesn't really do what he told Obito it does, but rather it's a way for him to gain greater power. I mean, after all, he is evil, so it wouldn't be surprising if he had lied to Obito.
The interesting part is that these two do have same goal but different intentions. I can't help but think that Obito might try to kill Kakashi when Juubi is defeated, like "I can't never see Rin because of you!" Of course, he doesn't blame him for that moment but he will take his anger of losing to someone and Kakashi seems best fit. Obito so far looks pissed that the alliance can destroy his dream. He was mad when Madara acknowledged the strength of the alliance as to say "Hm, I won't be surprised we lose." Obito is incredibly desperate to win.